How do I work out Nether coordinates from Overworld ones?

Divide X and Z by 8 to go from the Overworld to the Nether; multiply them by 8 to return. Y stays unchanged. Overworld 800, 63, -160 becomes Nether 100, 63, -20. Select Nether to Overworld for the reverse direction.

Does Y get divided by 8 as well?

No. Only X and Z use the 8 to 1 ratio. Y is carried across unchanged. The tool displays fixed height warnings for some values; it does not choose a valid portal height for your edition or world.

Which way should a negative coordinate be rounded?

Choose Down, Nearest or Toward zero. For -889 divided by 8, the exact value is -111.125: Down gives -112, while Nearest and Toward zero give -111. In Nearest mode a halfway value goes toward the higher coordinate.

Why did my portal link to a portal that was already there?

The game may use a nearby existing portal. This calculator does not model that search or read the portals in your world. Its converted coordinate is a placement target, not a guarantee that two portals link.

Why does converting back not give me the number I started with?

Rounding loses the fractional remainder. Overworld -889 becomes Nether -112 when rounded down; multiplying -112 by 8 returns -896. The exact value column shows what was rounded.

How should I enter coordinates from the debug screen?

Enter each coordinate in its own field using plain signed digits and up to five decimal places. A whole debug-screen line is not a supported paste format. The Copy button returns target X, Y and Z separated by spaces.

Does this work for Bedrock Edition, and what about the End?

For Java and Bedrock coordinate inputs, this page applies the fixed 8 to 1 horizontal rule. It does not simulate version-specific portal searches, roof construction or frame rules. The End is not a supported destination.

Does it calculate portal distance, frame size or roof placement?

No. It converts one coordinate triplet. It has no second endpoint for distance, no frame dimensions or material count, and no roof placement mode. A target Y above 127 receives a fixed warning, so the result should not be treated as edition-specific roof support.

Nether Portal Calculator

Convert Minecraft Overworld coordinates to the Nether and back. Choose the direction, enter X, Y and Z, and pick a rounding mode. X and Z are divided or multiplied by 8; Y stays unchanged. The result shows exact values beside the rounded target blocks. It gives a coordinate to build at, while nearby portals can affect the actual link.

Overworld to Nether8:1Down

overworld   X 1432   Y 68   Z -889

exact       X 179           Z -111.125
nether      X 179    Y 68   Z -112

Y is carried across, never divided

Nether X: 179
Nether Y: 68
Nether Z: -112
Rounding: Down

One block in the Nether covers 8 in the Overworld, so X and Z are divided by 8.
Rounded down: -111.125 becomes -112.
Y 68 is carried across unchanged: the 8 to 1 ratio is horizontal only.
This is a coordinate to build at. Whether the game links it to a portal that already stands nearby, instead of the one you build, depends on what is there.

The coordinates you are holding

Read them off the debug screen: F3 in Java Edition, or Show Coordinates in the Bedrock world settings. Up to five decimal places are kept, so a position pastes in as readily as a block.

Direction

Overworld XOverworld YOverworld Z

How to round

Always toward the lower block, so -111.125 becomes -112. This is how the game itself turns a position into a block.

Rounding

Worked both ways

The same three lines the arithmetic above produces, run through the very same functions.

1432, -889 to Netherdivide by 8
179, -112
179, -112 to Overworldtimes 8
1432, -896
Y68
unchanged both ways

Accuracy. Exact arithmetic at the 8 to 1 ratio, with the unrounded value shown beside the rounded one and Y carried across rather than divided. It gives you a coordinate to build at; whether two portals link also depends on what is already built nearby.

Common questions

How do I work out Nether coordinates from Overworld ones?: Divide X and Z by 8 to go from the Overworld to the Nether; multiply them by 8 to return. Y stays unchanged. Overworld 800, 63, -160 becomes Nether 100, 63, -20. Select Nether to Overworld for the reverse direction.
Does Y get divided by 8 as well?: No. Only X and Z use the 8 to 1 ratio. Y is carried across unchanged. The tool displays fixed height warnings for some values; it does not choose a valid portal height for your edition or world.
Which way should a negative coordinate be rounded?: Choose Down, Nearest or Toward zero. For -889 divided by 8, the exact value is -111.125: Down gives -112, while Nearest and Toward zero give -111. In Nearest mode a halfway value goes toward the higher coordinate.
Why did my portal link to a portal that was already there?: The game may use a nearby existing portal. This calculator does not model that search or read the portals in your world. Its converted coordinate is a placement target, not a guarantee that two portals link.
Why does converting back not give me the number I started with?: Rounding loses the fractional remainder. Overworld -889 becomes Nether -112 when rounded down; multiplying -112 by 8 returns -896. The exact value column shows what was rounded.
How should I enter coordinates from the debug screen?: Enter each coordinate in its own field using plain signed digits and up to five decimal places. A whole debug-screen line is not a supported paste format. The Copy button returns target X, Y and Z separated by spaces.
Does this work for Bedrock Edition, and what about the End?: For Java and Bedrock coordinate inputs, this page applies the fixed 8 to 1 horizontal rule. It does not simulate version-specific portal searches, roof construction or frame rules. The End is not a supported destination.
Does it calculate portal distance, frame size or roof placement?: No. It converts one coordinate triplet. It has no second endpoint for distance, no frame dimensions or material count, and no roof placement mode. A target Y above 127 receives a fixed warning, so the result should not be treated as edition-specific roof support.

Exact arithmetic at the 8 to 1 ratio, with the unrounded value shown beside the rounded one and Y carried across rather than divided. It gives you a coordinate to build at; whether two portals link also depends on what is already built nearby.